They're probably just rehearsing the material that would eventually be recorded; aka "pre-production". (working on arrangements, etc)
As far as Chris' legs...the shot has a slight "fish eye" lens distortion to it, which is most likely what is causing that effect. Plus, it would look weird if you assumed Chris was SEATED, but, in fact, she is standing.
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Among God's creations, two, the dog and the guitar, have taken all the sizes and all the shapes in order not to be separated from the man.---Andres Segovia
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